Passive amplifier



FIG. 1 is a perspective view of a passive amplifier, showing the claimeddesign;

FIG. 2 is a rear view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a right side view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The ornamental design which is claimed is shown in solid lines in thedrawings. The broken lines in the drawings are for illustrative purposesonly and form no part of the claimed design.

CLAIM The ornamental design for a passive amplifier, as shown anddescribed.